Orthodontic nipple



FIG. 1 is a front elevation view of an orthodontic nipple showing my new design;

FIG. 2 is a rear elevation thereof;

FIG. 3 is a side elevation taken from the right of FIG. 1, the side opposite being identical;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a bottom plan view. 

The ornamental design for an orthodontic nipple, as shown and described. 